I have a Dracaena fragrans (corn plant) which is dying. I originally purchased it just over a year ago, when a similar plant I had (Yucca elephantisis) died in a similar manner. Basically, what happens is that the new growth on the cane starts to turn brown and dry out from the bottom upward. I originally had 3 canes, and now I'm down to a single cane with a healthy growth on it. I just saw yesterday that the growth is now starting to turn brown at the base, which indicates it will soon exhibit the same signs and dry out/die.
I'm not sure what I'm doing incorrectly. At first, I thought I was over-watering the plants. I watered it about once every other week, with enough water to saturate the soil. I then made sure that it could drain by adding a bit of sand to the base of the pot, and putting fresh soil over this, which I did last summer (July, I think), so it was last re-potted in July of 2011.
I'm not sure what I'm doing wrong with this plant... I can't seem to keep it alive! Could you help me figure out what I'm doing wrong?